Improvement in screw-presses



waited.. tant.

FREDERICK H. -LAEOEGE AND GEORGE E. soMEEs, vor AWATERannir, AAssIeNonsTo TEEMsELvEs AND N. A. BALDWIN, -OE MILEOED, CONNECTICUT.

Laim 'Patent No. 93,097, dated Jut, 27,1869.

The Schedule referred to in these Letters Patent and making part of thesame.

To all whom it 'may concern Be it known that we, FREDERICK H. LAFORGEand GEORGE E. SOME'RS, of Waterbury, in the county of New Haven,andState of Connecticut, have invented a new Improvement in Screw-Press;and we do hereby declare the following, when taken in connection withthe 'accompanying drawings, and the letters of reference marked thereon,to be a full, clear, and exact description of the same, and which saiddrawings constitute part of this specification, and represent, in

Figurel, a front view, and in v Figure 2, a top view.

fl"his invention relatesl to an improvement in stamping-presses, such asemploy a screw to raise and lower the die, and are commonly operated bylong arms extending out, by which the operator turns the screw. A numberQf revolutions being required to force down the die, and a correspondingnumber to raise it, the power is vgiveu,to a great extent, by themomentum ofthe levers, which are made very heavy. This construct-ionmakes theI process of stamping' comparatively slow, and -the Object ofour invention is to apply. power to drive the screw both down andup. Tothis end,

Our invention consists-iu applying', to the screw, a wheel, and causingthe screw to revolve by the application of a revolving frictionalsurface to the said wheel, the said revolving surface adjustable, so asto arrest and reverse the operation of the screw, at pleasnre.v

' To enable others skilled in the art to construct and use ourimprovement, we will fully describe the same as illustrated in theaccompanying drawings.

A represents the frame of a press, which may be of any known orconvenient construction.

B, 4the cross-bar, through which .the threaded screw C works, runningdown therethrough when turned in one direction, and up when turnedin theopposite direction,the said screw, or a shaft to which it is attached,extending' up,so as to have a bearing at D.-

On the said screw, we fix a wheel, E, which we preferto make ofsuiiicient weight to give to the screw, when revolving, the necessarymomentum but, if preferred, the wheel may be lighter, and the extraweight .applied at someother point on the shaft of the screw.

. E is a cross-bar, arranged so asto slide freely up and down in theframe with the screw as it traverses up and down, aud'which alsohasalateral motion given to it by means of a lever, G, (see iig. 2,)which will throw' the saidl cross-bar to the' right or left, as the casemay be..

To the said cross-bar, at each side of -tlie wheel E,

is fixed a shaft, carrying a pulley, H, and a frictionwheeLI, upon oneside, and a pulley, J, and frictioni wheel K, on the other side.-

To each ofthe said pulleys H and J, power is applied, to drive them inopposite directions; and to them a rapid revolution should be given.

' When the bar F stands in a central position, as denoted in black, lig.2, then neither of the friction-wheels I or K will bear against thesurface of the wheel E;

but when the lever G is pressed to the left, as denoted in blue, thenthe friction-wheel K is brought'to bear hard against thev surface ofthewheel E, which causes the wheel E to revolve, and force the screw up ordown,

as .the case may be, (for convenience of illustration,4

say down and whenfn. sufficient velocity has been given to-the wheel E,that the momentum will carry the screw down with sufficient force, thenthe wheel E may be relieved from the action of the wheel K;

and immediately before, or as soon as the die-carried by the screwstrikes the corresponding die, the other lor opposite revolving wheel- Ishould be pressed against the wheel E, by turning the lever G to theopposite side, as denoted in red, lig. 2. This will prevent any .inj uryor strain uponthe machine by the instantaneous stopping-of the screw,and .will immediately thereafter reverse the movement of the wheel E, soas to raise the screw; and as the screw approaches its highest point,the wheel K is againapplied, to arrest the movement of therevolvingwheel E, and reverse its operation, as required; Aand so on,the press may be operated with great rapidity.-

The bar F traverses up and down with the screw, and, as this and themechanismattachedlo it and the screw are of no inconsiderable weight, itis desirable to counterhalance this, that is, to relieve' the screw fromcarrying such a load. lo this end,-.we apply couuterweights L L, bycords or chains f, running over

